Reduction of Photo-Leakage Current in ZnO Thin-Film Transistors With Dual-Gate Structure

Origin of photo-leakage current in ZnO thin film transistors (TFTs) has been attributed to tunneling current through the Schottky contact properties of source due to Schottky barrier narrowing by light-induced holes. Therefore, it is important to maintain sufficient potential barrier width under light-irradiation in order to suppress the photo-leakage current. It is shown that dual-gate ZnO TFTs are effective to reduce the photo-leakage current.